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Aethos Expert


2021 Aethos Expert

What if we used every ounce of experience we’ve gained serving riders over the past 46 years and built a bike made simply for the love of riding? The Aethos is designed to straddle the line between perfect ride quality, extreme lightweight, and undeniable style. The Aethos Expert model is no exception.

With quick-shifting, low-maintenance Ultegra Di2 electronic shifting and hydraulic disc brakes paired with bomb-proof DT Swiss R470 Disc wheels, you have the perfect steed to excite you out on the road.

Technical Specifications

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Aethos FACT 10r Carbon, Rider First Engineered™, Threaded BB, 12x142mm thru-axle, flat-mount disc



FACT Carbon, 12x100mm thru-axle, flat-mount disc



Specialized Expert Shallow Drop, alloy, 125mm drop x 75mm reach


Body Geometry Power Expert


Specialized Pro SL, alloy, 4-bolt


Supacaz Super Sticky Kush


Roval Alpinist Carbon Seatpost

Seat Binder

Specialized Alloy, 30.0mm


Front Brake

Shimano 105, Hydraulic disc

Rear Brake

Shimano 105, Hydraulic disc


Shift Levers

Shimano Ultegra Di2 Disc R8070

Front Derailleur

Shimano Ultegra Di2 R8050, braze-on

Rear Derailleur

Shimano Ultegra Di2 R8050, GS medium cage


Shimano Ultegra, 11-speed


Shimano Ultegra R8000, 11-speed, 11-30t


Shimano Ultegra R8000, HollowTech 2, 11-speed

Bottom Bracket

Shimano Threaded BSA BB


Front Wheel

DT Swiss R470 rim, 20mm internal width, tubeless ready, 24h, Specialized full sealed bearing thru axle hub, centerlock disc, DT Swiss Champion 14G stainless steel spokes, DT Swiss brass nipples.

Rear Wheel

DT Swiss R470 rim, 20mm internal width, tubeless ready, 24h, Specialized full sealed bearing thru axle hub, centerlock disc, alloy freehub body, DT Swiss Champion 14G stainless steel spokes, DT Swiss brass nipples.

Front Tire

S-Works Turbo, 120 TPI, folding bead, BlackBelt protection, 700x26mm

Rear Tire

S-Works Turbo, 120 TPI, folding bead, BlackBelt protection, 700x26mm

Inner Tubes

Turbo Ultralight, 48mm Presta valve

* Weights based on production painted frames as pictured. Actual weights will vary based on colorway, frame size, and component variation. Specifications are subject to change without notice.


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Crank Length165mm170mm172.5mm172.5mm175mm175mm
Handlebar Width380mm400mm420mm420mm440mm440mm
Stem Length80mm90mm100mm100mm110mm110mm
Saddle Width155mm155mm143mm143mm143mm143mm
Seatpost Length300mm300mm360mm360mm360mm360mm
Head Tube Length109mm120mm137mm157mm184mm204mm
Head Tube Angle71.75°72.5°73°73.5°73.5°74°
BB Height266mm266mm268mm268mm268mm268mm
BB Drop74mm74mm72mm72mm72mm72mm
Fork Length, Full369mm369mm369mm369mm369mm369mm
Fork Rake/Offset47mm47mm44mm44mm44mm44mm
Front Center574mm577mm579mm591mm606mm613mm
Chainstay Length410mm410mm410mm410mm410mm410mm
Top Tube Length, Horizontal508mm531mm540mm562mm577mm595mm
Bike Standover Height705mm728mm748mm769mm796mm824mm
Seat Tube Length431mm462mm481mm504mm532mm567mm
Seat Tube Angle75.5°74°74°73.5°73.5°73°

Rider Reviews

  • 5
  • 5 Reviews

Light and Right

I have raced and ridden two S Works Tarmac bikes over the past ten years and like the fit of the 56cm. I bought the Aethos due to the geometry being similar. The plus is that I am able to put a 33mm tire in this frame and take it on the rougher terrain. The comp came with aluminum wheels so adding the carbon Roval wheels makes for an incredible climbing bike for sure. The Ultegra Di2 is indistinguishable from the Dura Ace di2 to my experience. I would say that for the price point and the weight/price ratio even with the extra $2.5K for the wheelset, it is a good deal.

Would Recommend?



Love this bike!

Bought this bike in red tint and upgraded the wheels to the carbon Roval Alpinist. Absolutely love this bike. Light, responsive, and climbs beautifully. Feels like an extension of my body on the way down the hills. Awesome.

Would Recommend?



Wow! This is some bike

After riding a Ti frame for 14 years, it was time for a change. And after doing some shopping around, this is one amazing bike. So light, quick in the corners, climbs like a dream, smooth in the rough stuff, snappy when standing on the pedals Super impressed with everything about the bike.

M.Mc P.


If you could ride a cloud, it would feel like this

For years I had my heart set on a Tarmac, but when I test rode both the Tarmac and the Aethos the choice was easy - I got the Aethos Expert. It truly does feel and ride like a ""ride all day"" bike, and soaks up the road bumps and chatter noticeably better than the Tarmac. The Aethos floats up climbs and descends faster than my other road bikes. During my usual Sunday group ride, I found myself keeping up on the descents with no effort, whereas in the past I always got dropped or had to hammer to keep up on the descents. No longer. And the climbs? I set a new PR on a nearby hill today without pushing that hard and using fewer watts than I did to get almost the same time on the segment using my other road bike. If you like climbing you'll love this bike. Every new bike is a joy to ride, but this bike brings more joy than most--especially when you see yourself keeping up with or dropping guys who usually leave you behind. The Di2 is crisp, fast, and precise. The shallow-drop bars are comfy on the hoods and the drops. I've never been a fan of the Power saddles, but the one on here feels great for some reason. All in all this bike is the perfect combination of comfort and speed.

Mountain G.